<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(obj,index) in list" :key="obj.id">
            <td>{{obj.id}}</td>
            <td>{{obj.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:obj.price>100}">{{obj.price}}</td>
            <td>{{obj.time|FormData}}</td>
            <td><a href="#" @click.prevent="delFn(index)">删除</a></td>
          </tr>
        </tbody>
        <tr v-if="list.length !==0"
        style="background-color: #EEE">
     <td>统计:</td>
     <td colspan="2">总价钱为: {{ allPrice }}</td>
     <td colspan="2">平均价: {{ svgPrice }}</td>
</tr>
        <tfoot v-if="list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addBtn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from 'moment'
import "bootstrap/dist/css/bootstrap.css" // 默认找文件夹下的index文件(但是这个不是所以需要写路径)
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: JSON.parse(localStorage.getItem('pList'))||[]
    };
  },
  methods: {
    addBtn(){
      if (this.name.trim().length == 0|| this.price === 0) {
        alert('不能为空')
        return
      }
      let id = this.list.length == 0? '100':this.list[this.list.length-1].id + 1
      this.list.push({
        id : id,
        name:this.name,
        price:this.price,
        time: new Date()
      })
    },
    delFn(index){
      this.list.splice(index,1)
  }
  },
  filters: {
    FormData(val){
      return moment(val).format('YYYY-MM-DD')
    }
  },
  computed:{
    allPrice(){
     return this.list.reduce((sum,obj)=>sum += obj.price,0)
    },
     svgPrice(){
       return (this.allPrice / this.list.length).toFixed(2)
     }
  },
  watch:{
    list:{
      handler(){
        localStorage.setItem('pList',JSON.stringify(this.list))
      },
      deep:true,

    }
  }
};
</script>

<style >
.red{
  color: red;
}
</style>